“2 Stroke” is short for “two-stroke cycle,” which refers to a type of engine used on model airplanes, leaf blowers and other machines. The two strokes are the downward and upward motions of the piston inside the cylinder. The downward stroke causes pressure in the crankcase, which forces fuel/air mixture up a passage to an opening in the cylinder, where it also assists the spent fuel to exit the exhaust opening. The upward stroke causes the piston to cover the exhaust and bypass openings, and pressure is reduced in the crankcase. This causes a new charge of fuel/air mixture to be drawn in through the carburetor, while pressure is increased in the cylinder until the compressed fuel/air mixture is ignited by the glow plug. Pressure from the burning fuel then drives the piston downward to begin the next cycle. Note that two-stroke engines “fire” each time the piston reaches the top. (See 4 Stroke)

A frequency reserved for general commercial use. Often used in toys and other consumer electronics that transmit data wirelessly. Because of this, it is easier to get interference with your radio system while using this band. Often toy grade r/c equipment using this band will not mark which channel it is operating on, making it harder to use multiple toys at the same time.

“4 Stroke” is short for “four-stroke cycle,” which refers to a type of engine used on model airplanes, automobiles and other machines. The four strokes are two downward and two upward motions of the piston(s) inside the cylinder(s). The first (downward) stroke is called “intake,” which reduces pressure in the cylinder. With the intake valve open, this draws fuel/air mixture into the cylinder from the carburetor. The second (upward) stroke is called “compression,” and with both valves closed the fuel/air mixture is compressed until it is ignited by a glow plug or spark plug. The third (downward) stroke is called “power,” where the pressure from the burning fuel drives the piston downward. The fourth (upward) stroke is called “exhaust,” and with the exhaust valve open the piston forces the spent fuel out the exhaust pipe. Note that four-stroke engines “fire” every-other time the piston reaches the top. (See 2 Stroke)

FM Frequency band reserved for general air vehicles (planes, helicopters, etc.). Often used in remote control vehicles with dedicated receiver and transmitter with interchangeable crystals. Channels 11-60 are available channels in this band.

FM Frequency band reserved for general ground vehicles (cars, boats etc.). Often used in remote control vehicles with dedicated receiver and transmitter with interchangeable crystals. Channels 61-90 are available channels in this band.

A) Named after Rudolf Ackerman, this angle defines the correct angle that steering wheels must have to effeciently negotiate a turn. In a standard turn, the wheel on the inside of the turning radius must follow a more severely curved line than the outside wheel. By setting steering arms, one can successfully adjust the turning angle so that the inside tire turns at a larger angle than the outside. This results in better traction around the turn.

B) Ackerman angle is the angle of the king post which holds the hub, the angle is the verical displacement of the top of the king post rearwards, the inside turning wheel will effectivly move in a smaller radius than the outside wheel, this angle also helps in the self centering of the steering in a straight line.

It is the down aileron that causes greater drag and pulls the plane in the opposite direction one would expect ie left stick rt aileron down and nose to the rt unless rudder is properly applied. A cub is a good example of this characteristic.

To correct for this many computer radios will allow you to program in differential to give more up than down aileron.

Hinged control surface located at the trailing edge of each wing, that provides control of the airplane about the roll axis. Ailerons move in opposite directions in order to provide lift on one wing and the opposite force on the other, in the process "rolling" the aircraft in the direction of the wing with the raised aileron.

the angle between the wing's chord and the longitudinal axis of an aircraft (a fixed value). The wings are typically mounted at a small positive angle of incidence, to allow the fuselage to be "flat" to the airflow in normal cruising flight.